Index: ios/shared/chrome/browser/tabs/web_state_list_order_controller.mm |
diff --git a/ios/shared/chrome/browser/tabs/web_state_list_order_controller.mm b/ios/shared/chrome/browser/tabs/web_state_list_order_controller.mm |
new file mode 100644 |
index 0000000000000000000000000000000000000000..cafb8a4a86b9f1fd5e5d38f0df681f429a54a3aa |
--- /dev/null |
+++ b/ios/shared/chrome/browser/tabs/web_state_list_order_controller.mm |
@@ -0,0 +1,42 @@ |
+// Copyright 2017 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#import "ios/shared/chrome/browser/tabs/web_state_list_order_controller.h" |
+ |
+#include <cstdint> |
+ |
+#include "base/logging.h" |
+#import "ios/shared/chrome/browser/tabs/web_state_list.h" |
+ |
+WebStateListOrderController::WebStateListOrderController( |
+ WebStateList* web_state_list) |
+ : web_state_list_(web_state_list) { |
+ DCHECK(web_state_list_); |
+} |
+ |
+WebStateListOrderController::~WebStateListOrderController() = default; |
+ |
+int WebStateListOrderController::DetermineInsertionIndex( |
+ ui::PageTransition transition, |
+ web::WebState* opener) const { |
+ if (!opener) |
+ return web_state_list_->count(); |
+ |
+ if (!PageTransitionCoreTypeIs(transition, ui::PAGE_TRANSITION_LINK)) |
+ return web_state_list_->count(); |
+ |
+ int opener_index = web_state_list_->GetIndexOfWebState(opener); |
+ DCHECK_NE(WebStateList::kInvalidIndex, opener_index); |
+ |
+ int list_child_index = web_state_list_->GetIndexOfLastWebStateOpenedBy( |
+ opener, opener_index, true); |
+ |
+ int reference_index = list_child_index != WebStateList::kInvalidIndex |
+ ? list_child_index |
+ : opener_index; |
+ |
+ // Check for overflows (just a DCHECK as INT_MAX open WebState is unlikely). |
+ DCHECK_LT(reference_index, INT_MAX); |
+ return reference_index + 1; |
+} |